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A Bed-load Function Based on Kinetic Theory

ISSN号：1001-6279
期刊名称：International Journal of Sediment Research
时间：0
页码：-
分类：O643.36[理学—物理化学;理学—化学] TU312.3[建筑科学—结构工程]
作者机构：[1]PhD, Assoc. Prof., State key laboratory of Hydroscience and Engineering, Tsinghua Univ., Beijing 100084, China, [2]PhD, Prof., State key laboratory of Hydroscience and Engineering, Tsinghua Univ., Beijing 100084, China, [3]PhD student, State key laboratory of Hydroscience and Engineering, Tsinghua Univ., Beijing 100084, China
相关基金：Acknowledgements The authors wish to express their most sincere appreciation to the anonymous reviewers for their insightful suggestions which lead us to further discussion on the roles played by collisions between particles in bed load. Financial support from the Natural Science Foundation of China （NSFC, Grant No. 51039004）, the National Key Technologies R ＆ D Program of China during the 12th Five-Year Plan Period （No. 2012BAB05B01）, and the research funding from State Key Laboratory of Hydroscience and Engineering （Grant No. sklhse-2008-B-01） is also gratefully acknowledged.
相关项目：非均匀泥沙输移的基础理论

作者： Zhong Deyu|Wang Guangqian|Zhang Lei|

关键词：动力学理论, 负载, 推移质输沙, 泥沙颗粒, 速度分布函数, 玻耳兹曼方程, 实验数据, 天然河流, Bed load, Sediment transport, Open channel flow, Turbulence, Two phase flow

中文摘要：

水流带来的碎石运输在自然的河和做人的隧道的词法过程起一个基本作用。礼品水流带来的碎石功能根据运动理论导出的这份报纸。水流带来的碎石功能被关于它的纵的旅行距离集成床沉积的提取率获得，跟随爱因斯坦提出的水流带来的碎石上的基本概念。提取率是被表示一向上床沉积的流动并且由调用决定粒子速度分发功能由解决运动理论的 Boltzmann 方程发源。有六个另外的水流带来的碎石公式和试验性的数据的现在的公式的比较也在这份报纸被做。结果证明现在的水流带来的碎石公式与试验性的数据同意很好。另外，影响由于在水流带来的碎石上的粒子之间的碰撞被讨论它仅仅当对粒子起作用的shear 足够大增加床的随机的运动的集中和紧张时，水流带来的碎石的紧张的可估计的抑制被观察的表演装载粒子以便在沉积粒子之间的碰撞能发生。

英文摘要：

Bed-load transport plays a fundamental role in morphological processes of natural rivers and human-made channels. This paper presents bed-load function derived on the basis of kinetic theory. The bed-load function is obtained by integrating the pick-up rate of bed sediment with respect to its longitudinal travel distance, following the basic concept on bed-load put forward by Einstein. The pick-up rate is expressed as an upwards flux of bed sediment and determined by invoking the particle velocity distribution function derived by solving the Boltzmann equation of kinetic theory. Comparisons of the present formula with six other bed-load formulas and the experimental data are also made in this paper. The results show that the present bed-load formula agrees well with the experimental data. In addition, the influences due to collision between particles on bed-load is discussed which shows that an appreciable damping of the intensities of bed-load is observed only when the shear acting on particles is large enough to increase the concentration and intensity of random motion of bed load particles so that the collisions between sediment particles can occur.

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